If you re concerned that your furnace capacitor isn t operating properly you can test it by following a few simple steps.
Furnace blower capacitor test.
Shut off the power to the furnace at the fuse.
Remove the wires from the terminal and discharge the capacitor using the instructions included with your furnace.
Decide if under load or bench testing is best.
Bench or under load test.
Set a voltmeter to the x1 setting.
The capacitor will still hold a charge even without power.
Remove the blower housing inside the furnace to access the capacitor.
If the system is not running then a bench test will be the best bet.